Washington Week (video) | PBS

On the Webcast Extra, former Massachusetts Sen. Scott Brown has recently relocated to New Hampshire is planning a challenge to incumbent Sen. Jean Shaheen. After six hours of meetings with his Russian counterpart Sergei Lavrov, Secretary of State John Kerry's relationship is dissected by Bloomberg's Indira Lakshamanan. And an aid package for Ukraine has stalled in Congress.

Ukraine's interim Prime Minister visits the White House and Crimea referendum, CIA accused of spying on Senate intelligence committee, and the Republican party wins Florida congressional seat in special election. Joining Amy Walter of Cook Political Report: Susan Davis, USA Today; Ed O'Keefe, Washington Post; Indira Lakshmanan, Bloomberg News.

On the Webcast Extra, CNN's Gloria Borger examines the Republican response to President Obama's handling of the crisis in Ukraine and his talks with Russia's Putin. Plus, The New York Times' Peter Baker and LA Times' Doyle McManus look at the international reaction to Russia's actions. Is Putin just misunderstood? And Gwen Ifill asks, "Who has the most thankless task dealing with Ukraine?"

The U.S. is ramping up pressure on Russia to de-escalate the tensions in Ukraine by imposing sanctions and visa restrictions. NY Times' Peter Baker and LA Times' Doyle McManus report on the latest developments. Plus, Republicans, including many 2016 presidential hopefuls, gathered at the annual Conservative Political Action Conference to hone their message ahead of the 2014 midterm elections.

In the Webcast Extra, The Washington Post's Ed O'Keefe looked back at the lawmakers who pledged to donate their pay earned during October's government shutdown. How many members of Congress kept their pledge? Plus, TIME's Michael Scherer offers an inside look into the team that was brought in to fix healthcare.gov after its rocky rollout.

The aftermath of the revolution in Ukraine, the defeat of an Arizona bill that would have allowed business owners to refuse service to gay people on religious grounds, Rep. John Dingell's retirement, and the launch of 'My Brother's Keeper'. Joining Gwen: Ed O'Keefe, Washington Post; Pete Williams, NBC News; Michael Sherer, TIME Magazine; and Indira Lakshmanan of Bloomberg News.

On the Webcast Extra, with the nation's governors in Washington, DC, President Obama hopes to shift focus from national races and issues to the states. But in Wisconsin, investigations into Republican Gov. Scott Walker's first campaign continue. And in Vienna this week talks and negotiations about Iran's nuclear weapons program kicked off.

Ukraine violence tests U.S.-Russia relations, CBO report on minimum wage, political action money during election season and Mitch McConnell's bid for re-election as part of the 2014 races to watch. Joining Gwen: David Sanger, The New York Times; Jeanne Cummings, Bloomberg News; Amy Walter, Cook Political Report; Greg Ip, Economist.

On the Webcast Extra, The Washington Post's Karen Tumulty discusses her recent trip to the Granite State where former Massachusetts Sen. Scott Brown is exploring a potential run for the Senate. Plus, The Atlantic's Molly Ball asks “Do liberals control the Democratic Party”? While most Republicans consider themselves conservative, far fewer Democrats would describe themselves as liberal.

After the nation's capital was blanketed with snow, our special reporters roundtable explores the politics coming out of the White House and Congress this week. Joining Gwen: Karen Tumulty, Washington Post; Molly Ball, The Atlantic; and Alexis Simendinger, Real Clear Politics.

Which Congressional incumbents are vulnerable during their 2014 reelection campaigns? The LA Times' Doyle McManus reports on the prospects for Mitch McConnell, Mary Landrieu, Mark Pryor, and others. Plus, Congress is set to debate raising the debt ceiling later this month. Is the U.S. at risk of defaulting on its debts?

The latest political battle over healthcare sparked by a recent CBO report, why Democrats aren't promoting Obamacare successes, January job numbers & stock market anxiety plus a closer look at the 2014 political battle lines. Joining Gwen: Jim Tankersley, Washington Post; Janet Hook, Wall Street Journal; Beth Reinhard, National Journal; Doyle McManus, Los Angeles Times.

On the Webcast Extra, CBS News' John Dickerson reports on the latest developments for Chris Christie in the investigations of the shutdown of the George Washington Bridge. When did Christie know about the traffic jam? Plus, what led Rep. Henry Waxman (D-Calif.) to announce his retirement from Congress after 40 years? Also in Congress this week, after much debate, the House passed the farm bill.

A roundtable discussion on President Obama's 2014 year-of-action agenda, the determined GOP opposition, and chances for bipartisan compromise. Joining Gwen: John Dickerson, Slate Magazine & CBS News; Susan Davis, USA Today; Christie Parson, Tribune News; Todd Purdum, Politico & Vanity Fair.

On the Webcast Extra, comments by Mike Huckabee at the Republican National Committee's winter meeting renew discussion of the GOP's war on women.  Plus, a new HBO documentary about Mitt Romney's two failed presidential campaigns premieres this week.  NBC News' Pete Williams discusses the possibility of clemency for NSA leaker Edward Snowden.