Rep. Peter King (R-N.Y.) recently brought an online poker bill back to the forefront in Washington, D.C., and it's time to look at the ways investors can play this as online gaming expands. MGM Resorts (NYSE:MGM) and Caesars Entertainment (NASDAQ:CZR) would be two big winners if online gaming goes national, but analyst Travis Hoium has three hidden stocks to invest in as well. 

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