Consider Hispanics: "The voters who have the strongest ties to Mexico are the ones that are heaviest Democratic," he said. As time passes, and the children and grandchildren of immigrants move up the socioeconomic ladder, their priorities may change and they may start voting Republican, balancing out the electorate.
It's also possible that the parties' positions will evolve.
The Democrats' priorities may shift as minorities throw their support behind them, Trende said. If those priorities are not in line with the values of white progressives, those white voters may migrate to the Republican Party.
(Related: Census: Minorities Constitute 37 Percent of U.S. Population)
Whatever the changes, the driving forces will go beyond race, said Michael D. Hais, coauthor of two books on the millennial generation.
In 2028, some Baby Boomers — the oldest born in 1946 — will have reached their 80s. Rachel, from the famous Generation-X sitcom Friends, will be pushing 60. And the status updates (if such things still exist) of oldest millennials, born in 1982, will read "Happy 46th Birthday."
If these generations continue to vote as they have in the past, Boomers and Generation X-ers will remain pretty evenly split between Republicans and Democrats, he said.
Millennials, the largest generation numerically at 92 million, lean left on many issues, which would seem to favor Democrats, Hais said. But not all of them have begun to vote yet, so it's difficult to know how they will ultimately split.
No one knows how today's toddlers — born into the "plural generation" — will vote in 2028. Their beliefs and political affiliations will be determined by history that's yet to be written.
Their voting patterns will be influenced by more than their youth, said Ruy Teixeira, a senior fellow at the Center for American Progress.
"The thinking that because they're young they're destined to be liberal is not true," he said.
In 2028, Boomers will still be a forced to be reckoned with, said William Frey, senior fellow and demographer with the Brookings Institution.
Although the youngest voters will be infusing the electorate with diversity, there will still be a large number of older people who are not as diverse, he said. But the differences between the way those groups vote could be driven more by age than by race.
"Having an aged population of considerable size will bring up a whole set of issues that will diverge from the kinds of needs that these younger people will have," Frey said.
The demographic changes reflected in the Census Bureau release yesterday confirm a trend that social scientists and demographers have been watching for years, Teixeira said.
The minority share of the population has been increasing by about a half a percentage point a year, he said.
Four states and the District of Columbia had a population in 2011 in which more than 50 percent were of minority groups: Hawaii (77.1 percent minority), D.C. (64.7 percent), California (60.3 percent), New Mexico (59.8 percent), and Texas (55.2 percent), according to the census data.