WASHINGTON — Rick Santorum wants to ensure the GOP's policy platform represents conservatives' interests. Newt Gingrich wants help retiring his campaign debt and repairing his reputation.Both Republicans are expected to endorse their former rival Mitt Romney — and signal to their backers to fall in line behind the party's presumptive nominee — but each wants assurances that Romney will deliver for them. Neither is rushing toward the task.Meanwhile, it doesn't appear that Rep. Ron Paul of Texas is going to go that way. Paul is still in the race and hasn't yet recognized Romney as the party's nominee. The tea...