I'm using the Virginia State Board of elections website to compare precincts from the 2008 and 2012 elections to get insight into the Virginia results.
First, here's a few counties at 100%:
Fauquier County
2008 - Obama 14,616 McCain 19,227
2012 - Obama 14,873 Romney 22,399 Net 2,915 votes for Romney
Franklin City
2008 - Obama 2,819 McCain 1,576
2012 - Obama 2,830 Romney 1,496 Net 91 votes for Obama
Fredericksburg City
2008 - Obama 6155 McCain 3413
2012 - Obama 7114 Romney 4054 Net 318 votes for Obama
Follow me after the jump
Arlington County - Precinct 002
2008 - Obama 1051 McCain 433
2012 - Obama 1249 Romney 567 Net 64 votes for Obama
Arlington County - Precinct 014 (Clarendon!)
2008 - Obama 905 McCain 449
2012 - Obama 892 Romney 576 Net 140 votes for Romney (whaaa????)
Arlington County - Precinct 031 (Lexington) (MY HOME PRECINCT)
2008 - Obama 1018 McCain 465
2012 - Obama 1166 Romney 570 Net 43 votes for Obama (yeah baby)
Fairfax County - Precinct 119 (Laurel)
2008 - Obama 1441 McCain 1136
2012 - Obama 1547 Romney 1171 Net 71 votes for Obama
Fairfax County - Precinct 227 (Sunrise Valley)
2008 - Obama 660 McCain 502
2012 - Obama 677 Romney 542 Net 23 votes for Romney
Fairfax County - Precinct 305 (El Nido)
2008 - Obama 730 McCain 486
2012 - Obama 748 Romney 543 Net 39 votes for Romney
Fairfax County - Precinct 306 (Great Falls - i.e., the 1%)
2008 - Obama 639 McCain 673
2012 - Obama 379 Romney 522 Net 109 votes for Romney
Fairfax County - Precinct 314 (McLean)
2008 - Obama 724 McCain 608
2012 - Obama 832 Romney 643 Net 73 votes for Obama
Hampton City - Precinct 101
2008 - Obama 1,300 McCain 217
2012- Obama 1,420 Romney 226. Net 119 votes for Obama
Hampton City - Precinct 102
2008- Obama 1,711 McCain 96
2012- Obama 1,917 Romney 90. Net 212 votes for Obama.
Henrico County - Precinct 109/110 (Johnson)
2008 - Obama 349 McCain 327
2012 - Obama 396 Romney 335 Net 39 votes for Obama
Henrico County - Precinct 214 (Longdale)
2008 - Obama 650 McCain 398
2012 - Obama 688 Romney 413 Net 23 votes for Obama
Giles County - Precinct 103
2008 - Obama 567 McCain 853
2012 - Obama 441 Romney 844 Net 117 votes for Romney
Giles County - Precinct 302
2008 - Obama 641 McCain 723
2012 - Obama 576 Romney 801 Net 143 votes for Romney
Goochland County - Precinct 202
2008 - Obama 830 McCain 989
2012 - Obama 826 Romney 979 Net 6 votes for Obama
Goochland County - Precinct 501
2008 - Obama 828 McCain 1,931
2012 - Obama 511 Romney 1,337 Net 277 votes for Obama
Halifax County - Precinct 603
2008 - Obama 518 McCain 482
2012 - Obama 537 Romney 504 Net 3 votes for Romney
Halifax County - Precinct 801
2008 - Obama 740 McCain 287
2012 - Obama 730 Romney 254 Net 23 votes for Obama
I will continue to update -