ANCHORAGE -

Gov. Sean Parnell said he's more concerned about Alaska's future than his own political fate if the oil tax referendum passes on Tuesday.

Parnell championed the tax structure the referendum seeks to replace as a way to encourage investment and boost production. Critics say the tax cuts Parnell backed amount to a giveaway to Big Oil.

Neither Parnell nor the major Democratic candidate, Byron Mallott, is expected to have any real problem winning their respective primaries. The general election ballot also will feature Bill Walker, who finished behind Parnell in the 2010 GOP gubernatorial primary but is running this time as an independent.

Both Walker and Mallott support the referendum.

Parnell said if the referendum succeeds, it will be a moment of great uncertainty and risk for the state.