.....With an unusually large proportion of his donors already giving the maximum contribution allowed by federal law, Mr. Romney’s campaign has made repeated appeals to grass-roots donors in recent days... Mr. Romney has tacked a request for help onto the end of his stump speech in recent days, directing supporters to his Web site,... ........A spokeswoman said on Wednesday that Mr. Romney raised $11 million in February, bringing his total for the cycle to $77 million, much more than any other Republican in the race. But relatively little of it has come from small checks. Through the end of January,...