Senate Democrats are calling for a probe into superPAC fundraising. The announcement comes a day after release of the new political action committees#39; fourth-quarter 2011 fundraising, and after Republican Mitt Romney#39;s Florida primary victory — which was fueled in part by superPAC ads.

INDIANAPOLIS (Reuters) - The Indiana state Senate on Monday approved a controversial measure that would make it the first right-to-work state in the traditional manufacturing heartland of the country. The Republican-led Senate voted 28 to 22 in favor of the right-to-work legislation after two hours of debate, with nine of the majority Republicans voting against. The measure still must clear the ...

But first the veteran Kentucky Republican must help his party avoid pitfalls that could hurt its bid to wrest control from Democrats. Senate Minority Leader Mitch McConnell operates with a steely resolve, a political discipline that leaves nothing to chance.

A Republican-dominated Senate committee approves some oddly shaped configurations that drew sharp criticism from Democrats.

Republicans aiming to seize control of the U.S. Senate face a challenge in their crowded field of primary candidates in some states. It’s a hazard of the party’s own making.