(Reuters) - Presidential candidate Newt Gingrich has roared into the lead of the Republican nominating race, brushing off concerns about his work for a troubled housing company, a Reuters/Ipsos poll showed. Twenty-four percent of registered Republican voters would support the former speaker of the U.S. House of Representatives if the contest were held now, an increase of 8 percentage points from roughly a week ago, according to the poll, which was conducted on November 18-19. Mitt Romney, the former Massachusetts governor who has stayed near the top of most polls, garnered support from 22 percent of Republicans, slumping 6 percentage...