Twitter: 4 categories of … Brendan Loy (Twitter/FriendFeed) September 22, 2010 September 23, 2010 Comments Off on Twitter: 4 categories of … 4 categories of GOP Senate pickup chances: Certain (ND, AR, IN), Likely (PA, WI, CO), Tossup (NV, IL), Possible (WV, WA, CA). Need 10 of 11.