White can file as a write-in and run in the 2014 general election if he wishes. Many might be able to spell “James White” but might not understand how to write in a name on a ballot. Rush calls them “low-information voters”.
Filing as a write-in for the general could throw the election to the Democrat; but if the GOP nominee is a Paultard or a RINO (but I repeat myself), I might be willing to support such a strategy.
BTW, you posted earlier “No write-ins in primaries in TX and maybe anywhere.” Write-ins in primary elections certainly are allowed in some other states: just within the past 8 years, Charlie Wilson won the 2006 RAT primary in OH-06 as a write-in after failing to turn in 50 valid signatures (!) to make the ballot (Wilson then went on to win the general); Dave Loebsack of IA-02 also won his 2006 RAT primary as a write-in (after not turning in enough valid signatures) and then won the general; and Nancy Cassis ran as a write-in for the MI-11 nomination after Congressman Thadeus McCotter didn’t turn in enough valid signatures to make the ballot, leaving Paulistinian reindeer rancher Kerry Bentivolio as the only candidate on the ballot; unfortunately, Cassis lost to Bentivolio, and we’ll have to wait until the 2014 primary to replace him.
Nope. Only an independent may run as a write in in Texas. A person who has chosen to affiliate with a political party for the two year election cycle, may not. White affiliated with the Republican Party for this cycle by filing for a place on the ballot, in Texas House District 19, as a Republican:
http://www.texasgop.org/elections/candidates/
White might been able to unaffiliate if he had had time to withdraw his application for a place on the ballot. But if he had had time to do that, he could have just filed for Texas 36 in Congress.