"From October 13-20, Wallace's support fell from 20% to 15% nationally. In the North, the former Wallace vote split evenly between Humphrey and Nixon. In the border South, Wallace defectors were choosing Nixon over Humphrey by three to one."
Carter, Dan T. (1995, 2000). The Politics of Rage: George Wallace, the Origins of the New Conservatism, and the Transformation of American Politics. New York: Simon & Schuster. p. 352, 362-364.
The electoral vote was closer: 301 for Nixon, 191 for Humphrey and 46 for Wallace. Had HHH got 115,000 of Nixon's votes in California (only about 1.5 percent of the state total vote) and 45,000 more in Ohio (only about 1.2 percent), he would have won the election.
Wallace was a Democrat, but almost all his voters would have gone to Nixon in a two-candidate race. A post-election study broke the Wallace vote down as 80-20 for Nixon. So that close three-man race would have been a comfortable Nixon popular victory of about 54-46 percent in a two-man race.
President Humphrey would definitely have had a problem on his hands. By the end of his first 100 days in office, he would probably be just about where Bill Clinton is today. Clinton is stuck at 45 percent approval rating -- a figure that is very close to the percentage of the popular vote he got last fall (Clinton 43, George Bush 38, Perot 19).
With Wallace and the Republicans sniping at him, HHH might even have been lower.
Now, President Nixon had no such problem. Wallace personally was unhappy with him, but he could not keep his bloc intact. A Gallup Poll trial heat pitting Nixon, Wallace and the most popular Democrat in the spring of 1969 came out Nixon 52 percent, Wallace 10, Sen. Edward Kennedy 33. Wallace had lost about a fourth of his vote to Nixon, who made a blatant pitch for conservative Southerners.
Is doing worse in the polls at this stag... - Baltimore Sun
"Polls that showed Wallace winning almost one-half of union members in the summer of 1968 showed a sharp decline in his union support as the campaign progressed. As election day approached and Wallace's support in the North and Midwest began to wane, Humphrey finally began to climb in the polls. . . .
In October, Humphrey—who was rising sharply in the polls due to the collapse of the Wallace vote—began to distance himself publicly from the Johnson administration on the Vietnam War, calling for a bombing halt.
"It's always reassuring to find you've made the right enemies." -- William J. Donovan