"The President's proposal to cap the amount of accrued benefits in tax-favored retirement plans and IRAs misses the mark and should be rejected.... Likewise, ERIC opposes the President's proposal to provide the [PBGC] with authority to set risk-based premiums based on its determination of the credit worthiness of a plan sponsor.... Putting the PBGC in charge of determining not only the amount of the premium that individual employers pay, but also the means by which they are set -- with no effective oversight from Congress or another neutral party -- would create a direct conflict of interest."