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CHARLOTTE -- Charlotte's had its turn. Now St. Louis tries to woo the 2012 Democratic National Convention.

"We've got the venues, we've got the hotels, we're a city that supports them completely," said Kitty Ratcliffe, the president of the St. Louis Convention and Visitors Commission.

Thursday night, supporters in the Gateway City held a special concert to rev up support in the lead up to the expected visit by the DNC's site selection team.

Charlotte hosted the same group Tuesday and Wednesday.

"There's a lot on the table here for St. Louis, and you don't have to be partisan to recognize that," DNC Host Committee member Mack Bradley said.

Labor supporters in St. Louis are also working together.

Fifty unions in the region joined a pact to show solidarity for the city's DNC bid.

"Organized labor is a big part of the Democratic Party, you know, we're trying to show, that we're with them in this effort, and we would encourage them to come here. Nothing against Charlotte," Bob Soutier of the Greater St. Louis Labor Council said.

The union issue, and their alliance to the Democratic Party, could be an important factor in determining which of the four finalist cities is awarded the 2012 convention.

According to the organization Unite Here, Cleveland has at least nine hotels with unionized workers, St. Louis has at least 11 and Minneapolis at least 13.

Charlotte, meanwhile, has zero.

"From all indications we have not made that promise to relax any of our union rules that the Democratic party often assists in other cities and we should not relax them,” former Charlotte Mayor Pat McCrory said.

Current Charlotte Mayor Anthony Foxx downplayed the role of unions in deciding a city.

"Where we can build bridges and help make it work for Charlotte and the Democratic National Committee, we're going to do that,” Foxx said.