As of this time in the summer of 1991, only Paul Tsongas had made it clear he was running for the nomination.
Prompting sentences like this, from the August 8, 1991 Financial Times:
The shortage of declared Democratic candidates is in marked contrast to the same stage four years ago when half a dozen Democrats were formally in the race. The difference is largely explained by President George Bush's continuing high approval ratings in the polls and the widespread assumption that he will be nearly impossible to beat next year.
(oops, date fixed)
