Republican Debate Exposes Tensions

Jan. 20 (Bloomberg) -- Mitt Romney saw his rationale as the Republican presidential front-runner undercut as Newt Gingrich’s rise was threatened by allegations from an ex-wife and Rick Santorum fought them both in last night's debate that showcased tensions in the most turbulent day yet of the primary race. Peter Cook reports on Bloomberg Television's "InsideTrack." (Source: Bloomberg)