Head to head polls are really tightening with Hillary. Here are a few that she is losing in
Iowa v. Paul
Paul +1
Colorado v. Paul
Paul +3
Colorado v. Rubio
Rubio +1
Colorado v. Walker
Walker +1
Iowa v. Huckabee
Tie
Colorado v. Huckabee
Tie
She still has a very strong lead in head to head matchup in Virginia, averaging around +8. Colorado
If Republicans pick up Ohio/Florida (they need that to even exist) along with Colorado, they would still need to flip Wisconsin (10) or both Nevada(6)/Iowa(6) to win the nomination. The path is thin but there could be new possible battleground states. I also am assuming North Carolina will be red in this scenario.