Looking back at the March 4 primaries, Texas boasted 13,601,324 voters registered in time to cast a ballot.
An estimated 9 percent of the overall number of registered voters (about 1.3 million) voted in the Republican primary and 4 percent (500,000) voted in the Democratic primary.
Runoffs between the top two vote-getting candidates in a number of contests are scheduled for Tuesday, May 27, the day after the federal holiday, Memorial Day. Votes count big in any election, but as historic participation records reveal, the portion of the electorate that actually votes in runoffs is an even thinner slice of the whole. And voter turnout is especially low in mid-term (non-presidential election year) runoffs, as those set for May 27 will be. Usually about 2 percent of registered voters cast a ballot in those.