Ann Romney is such a supportive wife that even her birthday is a fund-raiser for her husband, Republican presidential hopeful Mitt Romney. Donald Trump, who’s endorsed Romney, and wife Melania will throw Ann a 63rd birthday bash at their flashy Trump Tower apartment April 17. Brenda Johnson is helping with the guest list, and attendees are being asked to pay $1,000 or make a $10,000 commitment to be named a host at the Women for Romney event. But for her less wealthy friends, Johnson, who was ambassador to Jamaica until 2009, helpfully e-mailed, “Those of us already maxed out may attend by bringing a new paying guest.” So if you’re a paying plus-one guest, now you know why.