The Conservatives are getting closer to the last throw of the dice.
They have fired off a barrage of policy announcements, promising just about everything except free Ferraris all round, they have contrasted their solid economic record with the catastrophic failure of the Labour years, and they have sought to portray the Labour leader as a man ill-suited to the pressures of office.
Despite the best efforts of the Tory-supporting newspapers, the Ukip vote appears to be holding up well. Not enough to ensure it a hat full of seats, but plenty enough to siphon off disgruntled Conservatives and hand Labour victories in closely contested marginals.
David Cameron could yet make a pitch for Ukip supporters by hardening his stance on Europe and threatening to lead a campaign to quit the EU if Brussels denies him far-reaching concessions. That might yet come late in the day if all else fails. But the risk-averse Mr Cameron, who much prefers a managerial approach to matters European, will probably decide that is a gamble too far. And it would smack of desperation and be denounced as such.
Not much left in the locker, then. But there is one very powerful if uncontrollable weapon yet to be unleashed: the blond bombshell aka Boris Johnson.