Even a plurality of Dems (49%) want it approved.

Via Pew Research:

As the Obama administration deliberates over whether to allow the Keystone XL pipeline to be built, the proposed pipeline continues to draw broad support from the public. Currently, 61% favor building the pipeline while 27% are opposed. These views have changed little over the past year.

As previous surveys on the pipeline proposal have found, there is far more support for constructing the pipeline among Republicans (84% favor) and independents (61%) than among Democrats. About half of Democrats (49%) favor building the pipeline while 38% are opposed.

The new national survey by the Pew Research Center, conducted Feb. 27-Mar. 16 among 3,335 adults, provides an opportunity for a detailed look at differences among Democrats on this issue. Opposition to building the pipeline is most widespread among highly educated Democrats, liberals and those with high family incomes.