(Reuters) - Mitt Romney is struggling to regain control of the race for the Republican presidential nomination, but his allies appear ready to offer him a strong crutch for the road ahead. Restore Our Future, the independent "Super PAC" that supports Romney, spent $13.5 million in January on ads attacking his rivals and still emerged with $16.3 million in the bank, according to disclosures filed Monday with the Federal Election Commission.The pro-Romney PAC, or political action committee, spent $12.3 million alone on TV, Internet and radio ads that went after former U.S. House of Representatives speaker Newt Gingrich, Romney's chief...