[3] Marostica, regarded as a moderate Republican, focused heavily on fiscal issues as a legislator, including transparency and loosening budgetary restrictions, and sat on the legislature's Joint Budget Committee during the 2009 session.

[7] Marostica became financially successful in real estate,[8] and, together with other partners in Loveland Commercial, has donated extensively to local causes, including endowing a chair in the business department of Colorado State University.

[10] Marostica was elected to the Loveland City Council in 2001, serving for three years, including a span as mayor pro tem,[10] before resigning in 2004 because of professional conflicts of interest.

McNaught was endorsed by the Colorado Club for Growth, who criticized Marostica for his support of higher taxes and his use of eminent domain when he was a member the Loveland city council.

[33] Although supported by Republican House leadership, the bill died in committee;[34] however, Marostica saw his transparency proposal implemented in 2009 by an executive order of Gov.

[48][49] After John McCain secured the Republican nomination, Marostica supported the McCain-Palin ticket, including kicking off a Sarah Palin rally in Loveland in October.

[56] In February, Marostica was the only Republican who announced plans to support legislation to repeal Colorado's Arveschoug-Bird limit, which capped the growth of general fund expenditures at 6 percent per year.

[60] Marostica was the prime sponsor of the bill in the House,[61][62] where, after surviving an attempted Republican filibuster in the Senate,[63] it was ratified, and later signed into law.

[66] Marostica also sponsored bills to allow golf carts, scooters, and small electric vehicles to travel on some public roads,[67][68][69] to allow state veterans organizations to provide burial for unclaimed remains of Colorado military personnel,[70] and to allow building inspectors from other municipalities to assess structural damage to properties, a proposal stemming from a May 2008 tornado in Windsor, Colorado.

[71] Marostica announced plans to introduce legislation to expand the definition of cigar bars to increase the number of establishments exempt from Colorado's indoor smoking ban,[72][73] but withdrew the legislation after facing opposition from Democrats;[74] that same week, he denounced as "inappropriate and offensive" a British National Health Service flyer distributed by a lobbyist linking smoking to erectile dysfunction, calling for an ethics investigation into the flyer.

[77] Marostica resigned his House seat to take the position, and handed control of his development company to his partner and son in order to avoid conflicts of interest,[78][79] Marostica named opening Asian markets to Colorado exports as a priority for his time in the new position,[78] in addition to encouraging new venture capital investment and retaining existing major employers despite the late-2000s recession.

[15][80] Marostica was replaced in the House by small business owner Brian DelGrosso,[81] and on the legislature's Joint Budget Committee by the more conservative Rep. Kent Lambert.