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What’s the political fallout of President Obama’s support for same-sex marriage? Plus, longtime Senator Richard Lugar, R-Ind., lost his party's primary. What does that mean for moderate republicans and incumbents? Also, the double-agent al-Qaeda plotter. Joining Gwen: Major Garrett, National Journal; John Dickerson, Slate Magazine & CBS News; Susan Davis, USA Today; Pierre Thomas, ABC News.

On the Webcast Extra: After Republican Richard Lugar’s defeat, how much power does the Tea Party have?  Plus, Mitt Romney came under fire for a bullying incident back in high school.  Will this have an effect on how voters perceive him?  Also, how dangerous is Yemen?