Where should the 2020 conventions be held?

[UWS]

Until now, according to Wikipedia, Las Vegas is the only candidate to host the Republican National Convention.

https://en.wikipedia.org/wiki/United_States_presidential_election,_2020#Potential_convention_sites

For the Democratic National Convention, the candidates are Brimingham (Alabama), Columbus (Ohio), Indianapolis (Indiana), New York City (New York) and St. Louis (Missouri).

https://en.wikipedia.org/wiki/United_States_presidential_election,_2020#Potential_convention_sites_2

I think the 2020 Democratic National Convention should be held in Columbus, which would help the Democrats to win Ohio and to defeat Donald Trump or Mike Pence (if Trump is impeached before the 2020 election) just like the 2016 Republican National Convention may have helped Republicans to win Ohio in 2016. Because we all know that no presidential candidate has ever won the White House without winning Ohio since 1964.