I don't know what to consider competitive? I'd say conservatively, it must be within 10 points margin of victory.
These are the ones I think will be within 10 points.
1) Virginia2) New Mexico3) Colorado
4) New Hamphshire, Shaheen will win by at least 8 but probably more.
5) Alaska
6) Oregon
7) Minnesota
Maine, possibly but I haven't seen any indication that this is getting closer.
9) Mississippi (Wicker-Musgrove race)
10) North Carolina
11) Texas I won't believe these polls until it shows at least 5 more this close spread over 1 months time.
12) Nebraska