Sen. John Cornyn is likely to sign up for another election cycle as chairman of the National Republican Senatorial Committee, say GOP sources. Cornyn has won plaudits from colleagues for his fundraising and the gain of six Republican Senate seats on Election Day. NRSC spokesman said Cornyn won’t make a final decision for another few days, but Senate GOP aides widely expect him to take the helm in 2012. Aides say he wants to help Republicans win control of the Senate, a realistic prospect in an election cycle when 21 Democrats — and two independents allied with the Democrats —...