The mere whiff of a scandal once unraveled political careers with stunning speed. Not anymore. Suddenly embroiled in a federal sex trafficking investigation, Rep. Matt Gaetz of Florida has denied the allegations, rebuffed suggestions that he resign and sent fundraising appeals that portray him as a victim of a “smear campaign.” He’s expected to make a high-profile appearance Friday at former President Donald Trump’s Doral golf club in Miami. The congressman joins a growing list of politicians from both parties — almost exclusively men — who are defying the traditional response to controversy. Rather than humbly step back from public life, they barrel ahead, insisting they did nothing wrong and betting that voters will forget alleged misdeeds once the news cycle eventually shifts.