A political attack line is building against Ro Khanna, arguing that a lawmaker who pushes to tax the rich made his own fortune by marrying into it — bad for his credibility on tax policy, neutral for markets.

• Khanna's wealth comes from his wife's family auto parts business, not a company he built.
• Critics point to the gap between his congressional salary and a fortune reported near $200 million.
• His résumé — lawyer, Stanford economics teacher, Obama Commerce Department — is being used to paint him as a career insider rather than a builder.
• The broader charge: it costs nothing to demand higher taxes on wealth you did not earn.

Outlook: Expect Khanna's personal finances to keep surfacing as a talking point as the tax-the-rich debate heats up ahead of the next election cycle.