If Marco Rubio wins re-election to the U.S. Senate, which would not surprise me, he will likely lead the 2020 Republican Presidential nomination polls in a few months. You know, in recent history, many politicians boosted their polling standing after winning re-election : it's George W. Bush's case after his re-election as Texas Governor on November 3rd 1998 (
https://en.wikipedia.org/wiki/Republican_Party_presidential_primaries,_2000#Polling) and Chris Christie's case after his re-election as New Jersey Governor on November 5th 2013 (
https://en.wikipedia.org/wiki/Nationwide_opinion_polling_for_the_Republican_Party_2016_presidential_primaries).
In addition, after Trump loses badly to Hillary Clinton, Republicans are likely to rebuke Trump's ideas and tell themselvelves : « if a candidate, like Rubio, able to attract minority voters, especially Hispanics, was the nominee this year, we probably would not have been in this situation. »
