What did the 2012 U.S.presidential election demonstrate about party cohesion?

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The 2012 U.S. presidential election demonstrated that stringent party cohesion can harm electoral chances, as evidenced by the defeat of Republican nominee Mitt Romney, who struggled to unite various factions within his party. This suggests that electoral success may require a balance between party unity and a degree of flexibility to appeal to a diverse electorate. The other options are either not supported by evidence from the 2012 elections (A and C), or are too broad and unsupported by evidence (D).

What Did the 2012 U