Loyalty To Trump On The Ballot In Tuesday's Primaries

Tuesday's primaries provide one of the clearest tests yet of how much GOP primary voters are willing to tolerate a candidate who has criticized President Trump.

Last week's Alabama primary saw one GOP incumbent forced into a runoff because of her opposition to the president, and that could happen again in South Carolina where Rep. Mark Sanford is up for reelection. There are also battles of Trump loyalty in the GOP races for governor of South Carolina and congressional contests today in Nevada.

Democratic women could emerge as their party's standardbearer in several more congressional contests critical to their party's hopes of retaking the House as well. And there are also some contests that highlight the liberal vs. moderate divides that have roiled some Democratic primary races this year as well.