Slim majorities have become more common in the U.S. House and Senate
Republicans will kick off the 119th Congress with the smallest margin of control in the U.S. House of Representatives in modern history.
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Trump leads on the economy; Harris, on abortion and several personal traits. And supporters of the candidates have different views of what governing actions would be acceptable.
Amid shifts in demographics and partisan allegiances, registered voters are now evenly split between the Democratic Party and the GOP.