There is currently a bill proposed to do that (for stocks, not prediction market betting, but eh it's a start): https://www.govtrack.us/congress/bills/119/hr5106

It currently has 99 Democratic sponsors and 31 Republican sponsors (note: there are more Republicans than Democrats in the House). It will probably not make it out of committee. 2 of the 4 Democrats on the committee have sponsored it; 0 of the 8 Republicans have.