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Republicans are more likely than Democrats to split their caucus in Congress.

We looked at vote data from the past 10 Congresses to see if there’s any truth to that claim. Party conformity is the percentage of votes from a party that aligns with the majority position. In House, Democrats voted with their party 90.4 percent of the time; Republicans 89.3 percent. In Senate, Democrats lined up with party 89.8 percent of times; Republicans only 86.6 percent. Most common conformity percentage for each party was 97 percent in House; 98 percent in Senate.