It's something how fast the political landscape changed. In 2013-14, before Trump got involved, Marco Rubio seemed like the future of the Republican party. You also would've thought Jeb Bush might have done better (even in his own state!). With all the millions he spent trying to beat Trump, didn't help him one bit. (Actually, he should've taken his campaign funds and give it to US!)
Only in government and politics, can you spend millions of dollars and have nothing to show for it.