Probably Tom Cotton. I see a Tom Cotton/Cindy Hyde-Smith ticket likely for the Republicans in 2024.
Are you serious? Hyde Smith? Cotton is not presidential material.
I think that Tom Cotton could win the Republican primary in 2024 (assuming that Donald Trump loses re-election), as even though he is a pretty vile character, he can unite both the neoconservatives and Trump supporters due to his policy positions. Cindy Hyde-Smith would probably be a decent running-mate for him given her strong pro-Trump position on nearly all public policy issues. Still, a Tom Cotton/Cindy Hyde-Smith ticker would end up being a sacrificial lamb Republican ticket, maybe only receiving 43% of the popular vote and 149 electoral votes.