That pitter-patter you might be hearing belongs to the hearts of Texas Democrats who might seem to be excited at the prospect of an actual serious challenger to run against U.S. Sen. Ted Cruz.

The cause of the racing heartbeat is U.S. Rep. Joaquin Castro of San Antonio, who has let it be known that he might run in 2018 against the man I’ve enjoyed referring to as the Cruz Missile.

Cruz is a Republican lawmaker who was the last man standing in the fight to deny Donald J. Trump the GOP presidential nomination. He made a heck of splash at last week’s Republican national convention by declining to endorse the man who beat him to the finish line.

He got booed off the Cleveland stage.

Will this damage him in Texas? My gut tells me he might face a stronger challenge from within his own party than he might face from a Democrat, even one as attractive, articulate and polished as Joaquin Castro.

https://www.texastribune.org/2016/07/26/joaquin-castro-considers-texas-senate-run-cruz/

I remain fervent in my belief that Texas is better served with a vibrant two-party system. We do not have a Democratic Party that is yet able to challenge Republicans at the statewide level. Republicans win big — every time. They’ve held every statewide office in Texas since 1998. I don’t see any sign of weakness in the GOP vise grip.

Will it present itself in 2018 when Ted Cruz runs for re-election to the U.S. Senate. Rep. Castro seems to think it might.

I hope he’s correct. Cruz simply is not my kind of senator.

However, I’m not yet ready to presume that the Cruz Missile will fizzle out.