On March 14, an important vote occurred in the U.S. Senate on whether to disapprove of President Trump’s declaration of emergency spending on a border wall. There are 53 Republicans. Twelve of them (22.6%) voted against President Trump.
Advocates of open primaries are constantly saying that open primaries produce more moderate office-holders. However, Republicans nominated in closed primary states were approximately twice as likely to vote against the President, than Republicans nominated in primaries in which independent voters may participate.
Fifteen Republican Senators are elected in states in which the Republican primary is closed. Of those 15, 6 voted against President Trump, or 40.0%.
Fourteen Republican Senators are elected in states in which the Republican primary is semi-closed. Of those 14, two voted against President Trump, or 14.3%.
Twenty-four Republican Senators are elected in states in which the Republican primary is open. Of those 24, four voted against President Trump, or 16.7%.