Kennedy hires insider to soothe critics By BEN SMITH & GLENN THRUSH | 12/15/08 7:19 PM EST Caroline Kennedy’s trial balloon candidacy for Hillary Rodham Clinton’s Senate seat was springing a few leaks over the past few days — so she’s made her ambitions more explicit and hired one of New York’s top political consultants to gain some altitude. After a week of coy courtship and low-key feelers, Kennedy began working the phones in earnest Monday — and signed up major Democratic fixer Josh Isay, who has deep connections to New York powerhouses Sen. Charles Schumer, Mayor Michael Bloomberg and...