  The electroweak (EW) sector of the Minimal Supersymmetric Standard Model
(MSSM) can account for a variety of experimental data. The lighest
supersymmetric particle (LSP), which we take as the lightest neutralino,
$\tilde \chi_1^0$, can account for the observed Dark Matter (DM) content of the
universe via coannihilation with the next-to-LSP (NLSP), while being in
agreement with negative results from Direct Detection (DD) experiments. Owing
to relatively small production cross-sections a comparably light EW sector of
the MSSM is also in agreement with the unsuccessful searches at the LHC. Most
importantly, the EW sector of the MSSM can account for the persistent
$3-4\,\sigma$ discrepancy between the experimental result for the anomalous
magnetic moment of the muon, $(g-2)_\mu$, and its Standard Model (SM)
prediction. Under the assumption that the $\tilde \chi_1^0$ provides the full
DM relic abundance we first analyze which mass ranges of neutralinos, charginos
and scalar leptons are in agreement with all experimental data, including
relevant LHC searches. We find an upper limit of $\sim 600$ GeV for the LSP and
NLSP masses. In a second step we assume that the new result of the Run 1 of the
``MUON G-2'' collaboration at Fermilab yields a precision comparable to the
existing experimental result with the same central value. We analyze the
potential impact of the combination of the Run 1 data with the existing
$(g-2)_\mu$ data on the allowed MSSM parameter space. We find that in this case
the upper limits on the LSP and NLSP masses are substantially reduced by
roughly $100$ GeV. This would yield improved upper limits on these masses of
$\sim 500$ GeV. In this way, a clear target could be set for future LHC EW
searches, as well as for future high-energy $e^+e^-$ colliders, such as the ILC
or CLIC.
