THIS could help Ted Cruz: Ex-Gore aide

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Sen. Ted Cruz's strategy of locking up unbound delegates throughout the nation could pay dividends, Democratic strategist Michael Feldman said Tuesday.

Cruz has recently secured the support of a number these delegates who can pledge to back a candidate regardless of primary or caucus results.

Republican presidential front-runner Donald Trump, meanwhile, essentially sat out nominating contests in Colorado and Wyoming, calling the systems in those states "rigged" to benefit Beltway insiders and shut down political mavericks.

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But Feldman told CNBC's "Squawk Box" that stance could hurt Trump later on. It remains uncertain whether Trump can secure the 1,237 delegates he needs to win the Republican nomination and avoid a battle on the floor of the Republican National Convention in July.

"While Trump is trying rhetorically to insulate himself, talking about [how] the system is rigged, and set stage for a contested — potentially contested — Republican convention, Ted Cruz has been out there actually finding delegates, and he's been doing it all around the country," said Feldman, a former aide to Vice President Al Gore and now a partner at Glover Park Group.

Going into Tuesday's New York primary, Trump had 756 delegates to Cruz's 559 and Ohio Gov. John Kasich's 144, according to RealClearPolitics.

All 34 Colorado delegates elected to go to the national convention are Cruz supporters. The Texas senator took 23 delegates in the Wyoming caucus, while Trump took just one.