IMO, there's a snowballs chance in hell that the Rams take Manziel at #2 overall. But, at #13, he might be the best option for the team.
I really like Bradford. But, his contract is ridiculous and Manziel looks to be a far better fit for a team that plans to run the ball and play a strong defense like the Seahawks and 49ers. He fits, the Russell Wilson, Colin Kaepernick type QBs in the division who gives their teams 500 or so yards rushing, makes improvisional plays to keep drives alive, and throws the fewest passes of all of the NFL starters.
And 5 of Jeff Fisher's only 6 double digit winning teams had QBs that can make plays with their feet (McNair & Young).